Simultaneous determination of trace Cd(II) and Pb(II) based on Bi/Nafion/reduced graphene oxide-gold nanoparticle nanocomposite film-modified glassy carbon electrode by one-step electrodeposition
Simultaneous determination of trace Cd(II) and Pb(II) based on Bi/Nafion/reduced graphene oxide-gold nanoparticle nanocomposite film-modified glassy carbon electrode by one-step electrodeposition
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DOI：
10.1007/s11581-016-1843-6
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发表时间：
2017-03
期刊：
影响因子：
2.8
通讯作者：
Guo Zhao;Hui Wang;Gang Liu;Zhiqiang Wang;Jin Cheng
中科院分区：
文献类型：
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作者：
Guo Zhao;Hui Wang;Gang Liu;Zhiqiang Wang;Jin Cheng
本文采用一种简单可控的一步电沉积方法，在裸玻璃碳电极（GCE）表面制备了一种新型的还原氧化石墨烯-纳米金（RGO-GNPs）纳米复合膜，然后将Nafion修饰在膜上，制备了一种用于方波阳极溶出伏安法（SWASV）中同时检测痕量Cd（II）和Pb（II）的电化学传感器。采用扫描电子显微镜（SEM）、能谱仪（EDS）、循环伏安法（CV）和SWASV对改性电极的形貌和电化学性能进行了表征。结果表明，在GCE表面形成的RGO-GNPs纳米复合膜能显著促进电子的转移，增大电极的比表面积。而Nafion膜能有效提高RGO-GNPs纳米复合层的附着力和稳定性，增强阳离子交换能力，防止实际样品中的大分子吸附在电极表面。Bi/Nafion/RGO-GNPs/GCE在浓度为1.0 ~ 90 μg/L范围内同时检测Cd（II）和Pb（II）具有良好的线性关系，检出限分别为0.08和0.12 μg/L （S/N= 3）。最后，将该电极进一步应用于土壤样品中Cd（II）和Pb（II）的测定，结果令人满意。
In this paper, a simple and controllable one-step electrodeposition method was used to fabricate a novel reduced graphene oxide-gold nanoparticles (RGO-GNPs) nanocomposite film onto the surface of bare glass carbon electrode (GCE), and then, Nafion was modified onto the film to prepare an electrochemical sensor for simultaneous detection of trace Cd(II) and Pb(II) in square-wave anodic stripping voltammetry (SWASV) with situ plating bismuth film. The morphologies and electrochemistry properties of the modified electrode were characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), cyclic voltammetry (CV), and SWASV. It was found that the formed RGO-GNPs nanocomposite film on the GCE surface could remarkably facilitate the electron transfer and enlarge the specific surface area of the electrode. While the Nafion film could effectively increase the adhesion and stability of RGO-GNPs nanocomposite layer, enhance cation-exchange capacity, and prevent the macromolecule in real samples absorbing on the surface of electrode. The Bi/Nafion/RGO-GNPs/GCE demonstrated a highly linear behavior in the simultaneous detection of Cd(II) and Pb(II) in the concentration range of 1.0 to 90 μg/L with detection limits of 0.08 and 0.12 μg/L (S/N= 3), respectively. Finally, The developed electrode was further applied to the determination of Cd(II) and Pb(II) in soil samples with satisfactory results.